target/linux/generic/patches-3.18/503-yaffs-add-tags-9bytes-mount-option.patch

   1 Subject: yaffs: add support for tags-9bytes mount option
   2
   3 Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
   4 ---
   5 --- a/fs/yaffs2/yaffs_vfs.c
   6 +++ b/fs/yaffs2/yaffs_vfs.c
   7 @@ -2605,6 +2605,7 @@ static const struct super_operations yaf
   8
   9  struct yaffs_options {
  10         int inband_tags;
  11 +       int tags_9bytes;
  12         int skip_checkpoint_read;
  13         int skip_checkpoint_write;
  14         int no_cache;
  15 @@ -2644,6 +2645,8 @@ static int yaffs_parse_options(struct ya
  16
  17                 if (!strcmp(cur_opt, "inband-tags")) {
  18                         options->inband_tags = 1;
  19 +               } else if (!strcmp(cur_opt, "tags-9bytes")) {
  20 +                       options->tags_9bytes = 1;
  21                 } else if (!strcmp(cur_opt, "tags-ecc-off")) {
  22                         options->tags_ecc_on = 0;
  23                         options->tags_ecc_overridden = 1;
  24 @@ -2717,7 +2720,6 @@ static struct super_block *yaffs_interna
  25         struct yaffs_param *param;
  26
  27         int read_only = 0;
  28 -       int inband_tags = 0;
  29
  30         struct yaffs_options options;
  31
  32 @@ -2757,6 +2759,9 @@ static struct super_block *yaffs_interna
  33
  34         memset(&options, 0, sizeof(options));
  35
  36 +       if (IS_ENABLED(CONFIG_YAFFS_9BYTE_TAGS))
  37 +               options.tags_9bytes = 1;
  38 +
  39         if (yaffs_parse_options(&options, data_str)) {
  40                 /* Option parsing failed */
  41                 return NULL;
  42 @@ -2790,17 +2795,22 @@ static struct super_block *yaffs_interna
  43         }
  44
  45         /* Added NCB 26/5/2006 for completeness */
  46 -       if (yaffs_version == 2 && !options.inband_tags
  47 -           && WRITE_SIZE(mtd) == 512) {
  48 +       if (yaffs_version == 2 &&
  49 +           (!options.inband_tags || options.tags_9bytes) &&
  50 +           WRITE_SIZE(mtd) == 512) {
  51                 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
  52                 yaffs_version = 1;
  53         }
  54
  55 -       if (mtd->oobavail < sizeof(struct yaffs_packed_tags2) ||
  56 -           options.inband_tags)
  57 -               inband_tags = 1;
  58 +       if (yaffs_version == 2 &&
  59 +           mtd->oobavail < sizeof(struct yaffs_packed_tags2)) {
  60 +               yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting inband tags");
  61 +               options.inband_tags = 1;
  62 +       }
  63
  64 -       if(yaffs_verify_mtd(mtd, yaffs_version, inband_tags) < 0)
  65 +       err = yaffs_verify_mtd(mtd, yaffs_version, options.inband_tags,
  66 +                              options.tags_9bytes);
  67 +       if (err < 0)
  68                 return NULL;
  69
  70         /* OK, so if we got here, we have an MTD that's NAND and looks
  71 @@ -2857,7 +2867,8 @@ static struct super_block *yaffs_interna
  72
  73         param->n_reserved_blocks = 5;
  74         param->n_caches = (options.no_cache) ? 0 : 10;
  75 -       param->inband_tags = inband_tags;
  76 +       param->inband_tags = options.inband_tags;
  77 +       param->tags_9bytes = options.tags_9bytes;
  78
  79         param->enable_xattr = 1;
  80         if (options.lazy_loading_overridden)
  81 --- a/fs/yaffs2/yaffs_mtdif.c
  82 +++ b/fs/yaffs2/yaffs_mtdif.c
  83 @@ -278,7 +278,8 @@ struct mtd_info * yaffs_get_mtd_device(d
  84         return mtd;
  85  }
  86
  87 -int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags)
  88 +int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags,
  89 +                    int tags_9bytes)
  90  {
  91         if (yaffs_version == 2) {
  92                 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
  93 @@ -297,6 +298,12 @@ int yaffs_verify_mtd(struct mtd_info *mt
  94                         );
  95                         return -1;
  96                 }
  97 +
  98 +               if (tags_9bytes && mtd->oobavail < 9) {
  99 +                       yaffs_trace(YAFFS_TRACE_ALWAYS,
 100 +                                   "MTD device does not support 9-byte tags");
 101 +                       return -1;
 102 +               }
 103         }
 104
 105         return 0;
 106 --- a/fs/yaffs2/yaffs_mtdif.h
 107 +++ b/fs/yaffs2/yaffs_mtdif.h
 108 @@ -21,5 +21,6 @@
 109  void yaffs_mtd_drv_install(struct yaffs_dev *dev);
 110  struct mtd_info * yaffs_get_mtd_device(dev_t sdev);
 111  void yaffs_put_mtd_device(struct mtd_info *mtd);
 112 -int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags);
 113 +int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags,
 114 +                    int tags_9bytes);
 115  #endif